mybatis配置数据源的两种方式

1.内置连接池

<configuration>
    <environments default="development">
        <environment />
            </dataSource>
        </environment>
    </environments>
</configuration>

2.引入数据源

<configuration>
    <!--引入数据源-->
    <properties resource="db.properties" />
    <environments default="development">
        <environment />
    </mappers>
</configuration>